[PATCH] drm/i915/snps_hdmi_pll: Fix 64-bit divisor truncation by using div64_u64

[Ankit Nautiyal]

DIV_ROUND_CLOSEST_ULL uses do_div(), which expects a 32-bit divisor.
When passing a 64-bit constant like CURVE2_MULTIPLIER, the value is
silently truncated to u32, potentially leading to incorrect results
on large divisors.

Replace DIV_ROUND_CLOSEST_ULL with div64_u64(), which correctly
handles full 64-bit division. Since the result is clamped between
1 and 127, rounding is unnecessary and truncating division
is sufficient.

Fixes: 5947642004bf ("drm/i915/display: Add support for SNPS PHY HDMI PLL algorithm for DG2")
Cc: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
Cc: Suraj Kandpal <suraj.kandpal at intel.com>
Cc: Jani Nikula <jani.nikula at intel.com>
Cc: <stable at vger.kernel.org> # v6.15+
Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_snps_hdmi_pll.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_snps_hdmi_pll.c b/drivers/gpu/drm/i915/display/intel_snps_hdmi_pll.c
index 74bb3bedf30f..ac609bdf6653 100644
--- a/drivers/gpu/drm/i915/display/intel_snps_hdmi_pll.c
+++ b/drivers/gpu/drm/i915/display/intel_snps_hdmi_pll.c
@@ -103,8 +103,8 @@ static void get_ana_cp_int_prop(u64 vco_clk,
 			    DIV_ROUND_DOWN_ULL(curve_1_interpolated, CURVE0_MULTIPLIER)));
 
 	ana_cp_int_temp =
-		DIV_ROUND_CLOSEST_ULL(DIV_ROUND_DOWN_ULL(adjusted_vco_clk1, curve_2_scaled1),
-				      CURVE2_MULTIPLIER);
+		div64_u64(DIV_ROUND_DOWN_ULL(adjusted_vco_clk1, curve_2_scaled1),
+			  CURVE2_MULTIPLIER);
 
 	*ana_cp_int = max(1, min(ana_cp_int_temp, 127));
 
-- 
2.45.2